Day One Review (2026): A Strictly Mediocre Series That Somewhat Entertains

Day One Review: Ten years after leaving everything behind, computer prodigy Ulises Albet receives a desperate call from his former best friend, Samuel Barrera, forcing him to return and save the world from the hands of imminent danger.

Day One Prime Video Cast

Álex González, Alba Planas, Asier Etxeandía, Renata Notni, Iván Massagué, Jordi Mollá, Mireia Oriol

Day One Series Director

Marta Pahissa, Víctor Cuadrado

The Spanish series has 6 episodes, each about 40 minutes long.

Day One Review: Melina Matthews, Álex González
Day One Review: Melina Matthews, Álex González

Day One Review

Prime Video’s Day One is an obvious affair that focuses on a dangerous technological discovery that threatens to change the way the world works. With the death of an old friend jolting Ulises from his slumber and running to figure out how to catch the perpetrator, and crack the case open, the series dabbles in the same-old story about a slimy tech company doing evil tech company things and murdering people in the name of innovation.

Its 6-episode runtime keeps a good pace, rushing through events without giving them much thought. People turn up dead, left, right and centre, and keep the series moving, with the central mystery of why at the helm of it. AI ethics is heavily discussed as this mind-blowing innovation threatens to take away even the illusion of privacy and freedom that human beings enjoy. I found the discussion quite interesting, and it leaves us invested in understanding the technology more.

Day One Review: Jordi Mollà
Day One Review: Jordi Mollà

The series does a good job if you’re looking for a light thriller show that doesn’t try to be too cerebral but still has a light sci-fi component to it, so that there is something to unearth and stop. However, there’s nothing too good or too bad about Day One; it’s strictly average and doesn’t make you feel too deeply about anything. A greater part of the runtime is spent following Ulises and Rebecca as they run around trying to save themselves from an assassin who seems to be having her own emotional problems.

It’s obvious where the story will go, or even what this earth-shattering technology is. Once you start watching it, you will understand exactly what it’s about or who comes out winning in the end. There is no clever twist that leaves you shocked in the end, nor does it particularly intrigue you. However, it’s not terrible either and leaves you somewhat entertained. The antagonist is spelt out from the first episode, and so is the reason why they are doing what they are. The series is all about stopping them from making this evil action, which takes the thrill out of watching the mystery unfold.

Day One Review: Álex González
Day One Review: Álex González

Also Read: Imperfect Women Review: A Gruelling Journey of Grief, Reinvention and Finding a Murderer

The characters were fairly interesting, and thankfully, there is no romantic angle here for once. There are a ton of characters, and most have something to do. Ulises is fairly enjoyable to watch, and so is Rebecca, who both have good chemistry. I enjoyed watching Álex González and Alba Planas in the series. They are both equally concerned with the horrifying reality of what Diskin is up to and do a good job of translating that concern to the viewers.

Final Thoughts

Day One Review: Álex González, Alba Planas
Day One Review: Álex González, Alba Planas

Day One is strictly average and, thus, quite unmemorable. It’s not terrible, but there’s nothing that distinguishes it from other shows in the genre. The storyline is quite obvious, and the series focuses more on stopping the bad guy instead of slowly uncovering the mystery, which is a shame. Overall, it’s fine, but there are just better shows to spend your time on.

What are your thoughts on Day One? Let us know in the comments below!

Also Read: Day One Ending Explained: What is the Dangerous Technology? Does Ulises Stop the Reign of Terror?

REVIEW OVERVIEW

Overall

SUMMARY

The series is entertaining to a degree although there's nothing special about it.
Archi Sengupta
Archi Sengupta
Archi Sengupta, a writer for over seven years, is an Engineering graduate with a Master’s degree in Mass Communication. She enjoys watching horror movies and TV shows, Korean content, and anything that thrills and excites her.

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The series is entertaining to a degree although there's nothing special about it.Day One Review (2026): A Strictly Mediocre Series That Somewhat Entertains